You can set up two equations to solve for this. I will set apple as “a” and juice as “j” Ricky: a + j = 3 Noel: 3a + j= 7 From here, you can solve this system of equations using substitution. I will solve Ricky’s equation for A. a + j = 3 a = 3 - j and then you take this and substitute that answer for a in Noel’s equation. 3a + j = 7 3(3 - j) + j = 7 9 - 3j + j = 7 9 - 2j = 7 -2j = -2 j = 1 Juice costs $1 (answer A)
It is one dollar because if you break down the fact that if you get an apple and a bottle of juice and you have to pay $3 then it's fairly easy to figure out that the only solution is that the apples cost $2 each so if you get three apples and one juice then you subtract 6 from 7 and you get $1